For the arrival of Chen Geng, a big tyrant, the Ivchenko Design Bureau was particularly enthusiastic, and Yuri Kravchenko, the deputy chief designer who had a good relationship with Chen Geng, gave Chen Geng a strong hug excitedly: "Mr. Fernandez, I am so happy to see you again." ”

"I'm also very happy to see everyone," Chen Geng patted Yuri Kravchenko happily: "How are you doing during this time?"

"Not bad," said Yuri Kravchenko, smiling, "wine, pickled cucumbers, bread, sausages, what luxury is there for the Soviets? At least our life is much better than that of many fraternal units." ”

Yuri Kravchenko is telling the truth, although the situation in the Soviet Union is much better than in the original time and space, but at the same time as prices are soaring, the ruble is still depreciating, and the ruble is still getting those rubles every month, the problem is that in 1991, the purchasing power of the ruble is already very insufficient, such as the Ivchenko Design Bureau, the Tupolev Design Bureau and other Soviet scientific research units that have a cooperative relationship with Chen Geng, but fortunately, there are "quotas" provided by Chen Geng every month , but those military industrial units that have no cooperative relationship with Chen Geng have a more miserable life.

This person is afraid of comparison, although the current life of the Ivchenko Design Bureau is not as good as before, but if you compare it with the brother units, everyone is quite satisfied with the current situation.

"Yes, Mr. Fernandez, if it weren't for your help, we would be much more difficult now. Vyacheslav Ivchenko, who was next to Yuri Kravchenko, nodded, with a little gratitude on his face.

Vyacheslav Ivchenko, the son of Alexander Ivchenko, the founder of the Soviet Ivchenko Design Bureau, and the current chief designer of the Ivchenko Design Bureau, also personally came out to greet Chen Geng.

"You're too polite, we're friends," Chen Geng said with a smile: "If we're friends, we should help each other." ”

"Yes, friends should help each other. ”

Vyacheslav Ivchenko smiled and nodded, he didn't believe Chen Geng's words at all, but this did not prevent Vyacheslav Ivchenko from adopting a more friendly attitude towards Chen Geng - without Chen Geng's help, the life of the Ivchenko Design Bureau would be too difficult.

According to Vyacheslav Ivchenko's idea, Chen Geng and his entourage had better take a rest first, and then go to the laboratory in the afternoon to see the situation of the AI-222-25 engine, but Chen Geng insisted on going now, Vyacheslav Ivchenko and Ryo Kravchenko persuaded him, and seeing Chen Geng's insistence, they also obeyed his wishes.

Coming to the power laboratory of the Ivchenko Design Bureau, Vyacheslav Ivchenko pointed to an engine fixed on the bench with a length of about 2 meters, and the overall height of the bench was just up to Chen Geng's waist, and said proudly: "Mr. Fernández, this engine is the AI-222-25 engine that we have just completed the high-altitude platform test, and it is also the most advanced military turbofan engine in the world today. ”

As early as the beginning of the design, the Ivchenko Design Bureau sent Chen Geng the initial information of the AI-222-25 engine, so Chen Geng has long been familiar with the data of the AI-222-25 engine, but looking at the data on paper is never as shocking as seeing the real guy in person: can you imagine that such a "tube" with a diameter of 624mm and a length of 1960mm can burst out with a thrust of more than 2500 kg, Take to the skies with an aircraft with a maximum take-off weight of more than 10 tons!

"Excellent!"

Chen Geng nodded again and again, although he couldn't see how good the engine in front of him was, but this did not prevent him from appreciating this engine.

It was Vyacheslav Ivchenko, he paused slightly, and then said to Chen Geng: "Do you remember, we said in the information we gave you before that the AI-222-25 engine is designed on the basis of the AI-25TL engine, so like the AI-25TL, the AI-222-25 engine is also a twin-rotor turbofan engine in terms of basic architecture. ”

"Yes, I remember. Chen Geng nodded.

"Although the basic architecture is the same, we have actually made quite a few modifications," Vyacheslav Ivchenko proudly and gushingly introduced to Chen Geng: "For example, compared with the core engine of the AI-25, the new AI-222-25 engine has improved the high-pressure compressor, added a first-stage high-pressure compressor, and redesigned low-pressure components.

In addition, we have not only increased the number of combustion chamber nozzles, but also re-optimized the combustion chamber design, so that the combustion chamber of the AI-222-25 is 5% more efficient than the combustion chamber of the AI-25TL.

In addition, there is a high-pressure turbine, the high-pressure turbine of the AI-222-25 adopts a similar cooling structure to the high-pressure turbine of the gas generator of the D-27 engine, and the AI-222-25 engine is the second turbofan engine in the Soviet Union to use a full digital control system plus mechanical and hydraulic backup after the D-90A engine......"

Chen Geng nodded again and again.

He naturally knows that the so-called D-90A is the PS-90A in Russia after the collapse of the Soviet Union, which makes countless military fans in China, especially the fans, drool, and hope to purchase and even introduce the engine - PS-90A is a military turbofan engine that we can theoretically buy and whose performance is comparable to the Pratt Whitney PW2040 engine on the Yankee's C-17 transport aircraft.

Of course, the idea is very good, but these Mao fans completely ignore one question: Is the old Mao Zi Ken?

Let's not talk about the question of Mao Xiongken's refusal to sell the PS-90A to us, even if the poor and crazy Mao Xiong Ken sells the finished product, just like selling us the D-30KP-2 and AL-31F, but Mao Xiong is willing to transfer the relevant engine technology to us?

You know, even if we purchased hundreds of D-30KP-2 and AL-31F, Maozi did not transfer the relevant manufacturing technology of these two engines to us - the reason why Chengfa Factory was able to manufacture the domestic version of D-30KP-2, that is, turbofan-18, was that Chengfa Factory was fighting for its own strength.

Moreover, even if Mao Xiong is willing to transfer the technology of the PS-90A to us, we have not completed the whole process from project approval to research and development and finalization, and we will always know why this engine is true, and for a sane and independent country with national defense, this is absolutely unacceptable - if we want to develop our own high-performance fighter, it is absolutely indispensable to go through the whole process of aero engines...... Seems to have gone off the rails again?

Chen Geng hurriedly came back to his senses and listened to Vyacheslav Ivchenko's reporter: "The right digital control system can ensure that the computer system monitors the operation of the engine in a timely manner, and ensures that the engine runs in the best state at any time, in addition, according to your original suggestion, we also designed the AI-222-25 engine as a unit structure at the beginning of the design......"

Speaking of this, Vyacheslav Ivchenko was visibly excited: "The design of the unit is really a good thing, in the process of use, once there is a unit that has reached the end of its life or is damaged in combat, it can be immediately replaced in the maintenance workshop of the front-line airfield, which greatly simplifies the maintenance procedure......"

What kind of unit structure, is a modular design!

The unit body is the name of the Soviet Union, Chen Geng is more accustomed to the name or "modular design", this concept is also the AI-222-25 engine project at the beginning of Chen Geng's proposal, the current Soviet Union, although for the convenience of front-line airport maintenance, although there is no clear concept of "modular design", but in the actual research and development has actually begun to do so, but the standard is not clear, not unified, and the modular work is not good enough.

But this time it is different, according to the agreement reached between Chen Geng and the Soviet government, the technology and patent of the AI-222-25 engine should be shared with himself, Chen Geng put forward a lot of suggestions on modularization, and now it seems that the Ivchenko Design Bureau has listened to these suggestions of its own.

Chen Geng is very satisfied with this, sometimes the designer is too whimsical and it is really a headache for investors: "I understand all this, but I am more concerned about the cost, compared with AI-25TL, how much higher will the production cost of AI-222-25 be?"

Many of the technologies of the AI-222-25 are inherited from the AI-25TL, and now, Chen Geng is more curious about how much more expensive the AI-222-25 engine will be to manufacture than the AI-25TL.

"Not a lot," says Vyacheslav Ivchenko, "about 20 to 23 percent." ”

Only a fifth-to-one-quarter increase?

Chen Geng was very satisfied with this cost increase, he nodded, and asked: "With the information you provided to me before, there are currently three versions of AI-222-25, the first version is the AI-222-25 without afterburner we saw, that is, the basic version, and the AI-222-25KFK version with a short afterburner and the AI-222-25F version with a standard combustion chamber, right?"

"Yes, there are only three versions that are tentatively planned now. ”

Although he didn't know why Chen Geng suddenly asked this question, Vyacheslav Ivchenko still nodded, and at the same time, he was a little curious about what Chen Geng wanted to say next.

"If I need to add a new version, what should this be?"

"Uh...... May I ask what kind of version you are going to add?" Vyacheslav Ivchenko hesitated for a moment and couldn't help but ask.

Chen Geng: "A civilian version with a duct ratio of 5.5 or more, more fuel-efficient than the military version of the AI-222-25, and at the same time lower noise. ”

"A civilian version of a large bypass ratio?"

Vyacheslav Ivchenko frowned, a little puzzled: according to what he knew, it seems that Mr. Fernández Chen did not have a turbofan engine that required this kind of thrust. However, it doesn't seem to be their business. Vyacheslav Ivchenko thought for a moment and nodded: "If the Military Industrial Equipment Committee and the government approve it, from a technical point of view, our Ivchenko Design Bureau will definitely have no problem." ”